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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626d53c86566c037d88a6a1167fedbb286dda0f46c3cd067e050036f91910212' 
  AND token = '6HMRUpQYPJngiBPK211yw00mpM99UbJOJGhwIFV1DfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}